MEMORANDUM FOR NTIA/OSM ASSOCIATED ADMINISTRATOR, MR PARLOW

FROM: AFFMA/SCA

SUBJECT: 18 GHz Exclusion/Coordination Zones

Reference is made to 7 January 1977 NTIA letter to the FCC Office of Engineering and Technology. This letter requested certain actions be undertaken by the FCC to protect Government earth stations in the Denver, CO, and Washington, D.C. areas.

As a further refinement to the protection required by the earth stations, the Air Force requests that the following 18 GHz exclusion and coordination zones be established in the vicinity of each city:

Civil System	Exclusion Zone (Km)	Coordination Zone (Km)
DEMS	150 Km	(not required)
Low Power (Outdoor)	55 Km	(not required)
Low Power (Indoor)	20 Km	(not required)
CARS	50 Km (Note 1)	Note 2, 3, 4
Pt-Pt	20 Km	Notes 3, 4

The above exclusion and coordination zones are with respect to the following center coordinates:

Washington, D.C.	38o48'00" N	76o52'00" W
Denver, CO	39o43'00" N	104o46'00"W

NELSON V. POLLACK, GM-15
Technical Director

Attachment:
Notes

cc: OASD/C3I (Raiford)
HQDA SAIS-SM
NAVEMSCEN (Code 00)
AFSPC/SCMA
JSC/AF

1. Except for a 5 Km radius around Morrison, CO (39^o39'16" N, 105^o10'57" W )

2. Including a 5 Km radius around Morrison, CO (39^o43'00" N, 104^o46'00" W)

3. For Washington, D.C.: 178 Km radius around 384800 N 0765200 W) and a box defined by the corners NE = 384000 N 0785000 W and SW = 381000 N 0792000 W)

4. For Denver, CO: Three boxes defined by the following corners:

Box 1:	NE =	413000 N	1031000 W
	SW =	383000 N	1063000 W
Box 2:	NE =	383000 N	1050000 W
	SW =	373000 N	1055000 W
Box 3:	NE =	400800 N	1070000 W
	SW =	395600 N	1071500 W